Hi Paul,
"Paul Edwards" <mutazi...@gmail.com> wrote on 02.09.2021 10:15:44:
> We got the IPL process in place on ESA/390, and then
> I decided that the next thing to do would be to switch
> to z/Arch so that we could get rid of the AMODE 31
> architectural limit on 32-bit programs.
>
> It all worked fine, and we were able to use GCC 11 to
> target S/390 and use the -m31 to generate 32-bit code,
> run it under z/Arch as AM64, sort of making it the
> equivalent of AM32. Really it is the equivalent of
> AM-infinity, and there's the rub - GCC 11 is generating
> negative indexes, which cause memory above 4 GiB
> to be accessed (instead of wrapping at 2/4 GiB), which
> of course fails.
Can you elaborate what exactly your goals are? The point
of the -m31 vs. -m64 option is exactly to match the
AMODE 31 vs. AMODE 64 hardware distinction, so trying to
run -m31 code in AMODE 64 is not supposed to work.
Bye,
Ulrich
